# US 12,009,734 B2 · Power conversion device and air conditioner

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- Number: US 12,009,734 B2
- Document ID: US12009734B2
- Status: Granted
- Kind: B2
- Application number: 17/913,871
- Filed: 2020-04-20
- Published: 2023-10-26
- Granted: 2024-06-11
- Earliest claimed: 2020-04-20
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Yusuke Yamakaji; Ikuro Suga; Satoru Ichiki; Koichi Arisawa; Tatsuya Yamanaka
- Web page: https://patentgrep.com/patent/US12009734B2

## CPC

- H02M 1/0064: {Magnetic structures combining different functions, e.g. storage, filtering or transformation}
- H02M 1/44: Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
- H02M 1/0012: {Control circuits using digital or numerical techniques (in DC/DC converters H02M3/157, H02M3/33515; in DC-AC converters H02M7/53873)}
- H02M 1/123: {Suppression of common mode voltage or current}
- H02M 1/126: {using passive filters}
- H02M 1/4225: {using a non-isolated boost converter}
- H02M 3/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections}
- H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections}
- H02M 7/53871: {with automatic control of output voltage or current}
- H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators
- H02M 3/33573: {Full-bridge at primary side of an isolation transformer}
- H02M 7/219: in a bridge configuration
- H02M 7/5387: in a bridge configuration
- H02M 7/797: using semiconductor devices only
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A noise propagating to outside of a power conversion device is reduced. A power conversion device includes at least one external electrode, a switching element, a noise filter connected between at least one external electrode and switching element, at least one first wire to connect at least one external electrode and noise filter, a second wire to connect noise filter and switching element, and a magnetic filter attached to second wire. An attenuation characteristic A [dB] and an attenuation characteristic B [dB] satisfy a relationship of B<A, where A is an attenuation characteristic of noise filter, and B is an attenuation characteristic due to spatial coupling between at least one first wire and second wire that is located between switching element and magnetic filter.

## Claims

### Claim 1

A power conversion device comprising:
at least one external electrode;
a switch;
a noise filter connected between the at least one external electrode and the switch;
at least one first wire to connect the at least one external electrode and the noise filter;
a second wire to connect the noise filter and the switch; and
a magnetic filter attached to the second wire, wherein
an attenuation characteristic A [dB] and an attenuation characteristic B [dB] satisfy a relationship of B<A, where A is an attenuation characteristic of the noise filter and B is an attenuation characteristic due to spatial coupling between the at least one first wire and the second wire that is located between the switch and the magnetic filter.

### Claim 2 (depends on 1)

The power conversion device according to claim 1, further comprising a reactor connected between the at least one external electrode and the switch, wherein
the noise filter is connected between the at least one external electrode and the reactor,
the second wire is connected between the reactor and the switch, and
the attenuation characteristic B includes an attenuation characteristic due to spatial coupling between the at least one first wire and the second wire that is located between the magnetic filter and the switch.

### Claim 3 (depends on 1)

The power conversion device according to claim 1, wherein the attenuation characteristic A is an attenuation characteristic of the noise filter for a common mode noise.

### Claim 4 (depends on 1)

The power conversion device according to claim 1, wherein
the attenuation characteristic A includes an attenuation characteristic of the noise filter at at least one frequency, and
the attenuation characteristic B includes an attenuation characteristic due to the spatial coupling at the at least one frequency.

### Claim 5 (depends on 1)

The power conversion device according to claim 1, wherein
the at least one external electrode includes a plurality of external electrodes,
the at least one first wire includes a plurality of first wires, and
the attenuation characteristic B corresponds to a maximum value of an attenuation characteristic due to spatial coupling between each of the plurality of first wires and the second wire that is located between the switch and the magnetic filter.

### Claim 6 (depends on 1)

The power conversion device according to claim 1, further comprising a magnetic shield disposed between the at least one first wire and the second wire that is located between the switch and the magnetic filter.

### Claim 7 (depends on 1)

The power conversion device according to claim 1, further comprising:
a first metal housing; and
a conductor plate connected to the at least one first metal housing and disposed between the first wire and the second wire that is located between the switch and the magnetic filter.

### Claim 8 (depends on 1)

The power conversion device according to claim 1, wherein the magnetic filter includes a ferrite core.

### Claim 9 (depends on 1)

The power conversion device according to claim 1, further comprising:
an input terminal;
an output terminal;
a printed circuit board on which at least the switch, the noise filter, the input terminal, and the output terminal are mounted;
a first connector connected to the input terminal on the printed circuit board; and
a second connector connected to the output terminal on the printed circuit board, wherein
the first connector and the second connector are disposed at opposite corners of the printed circuit board or at both ends of a long side of the printed circuit board.

### Claim 10 (depends on 1)

The power conversion device according to claim 1, wherein at least one of the at least one first wire or the second wire that is located between the switch and the magnetic filter includes a twisted cable.

### Claim 11 (depends on 1)

The power conversion device according to claim 1, wherein at least one of the at least one first wire or the second wire includes a shielded cable.

### Claim 12 (depends on 8)

The power conversion device according to claim 8, further comprising:
a printed circuit board on which at least the switch and the noise filter are mounted;
a housing to accommodate at least the printed circuit board; and
a fixing structure to fix the ferrite core to the printed circuit board or the housing.

### Claim 13 (depends on 8)

The power conversion device according to claim 8, wherein the second wire is provided with a mark that indicates an attachment position of the ferrite core.

### Claim 14 (depends on 2)

The power conversion device according to claim 2, wherein a part of the second wire includes a metal wire constituting the reactor.

### Claim 15 (depends on 1)

The power conversion device according to claim 1, wherein a part of the second wire includes a metal wire constituting the switch.

### Claim 16 (depends on 1)

The power conversion device according to claim 1, wherein a wire distance between the switch and the magnetic filter is less than or equal to 3 cm in a case where a distance between the at least one first wire and the second wire is greater than or equal to 0.3 m.

### Claim 17 (depends on 1)

The power conversion device according to claim 1 wherein
a distance between the at least one first wire and the second wire is greater than or equal to 0.2 m, and
a parallel running distance of the at least one first wire and the second wire is less than or equal to 0.1 m.

### Claim 18 (depends on 1)

The power conversion device according to claim 1 wherein a distance between the at least one first wire and a second metal housing is greater than or equal to 0.1 m and a distance between the second wire and the second metal housing is greater than or equal to 0.1 m in a case where the second metal housing is provided around the at least one first wire and the second wire.

### Claim 19 (depends on 1)

An air conditioner comprising:
the power conversion device according to claim 1;
a fan; and
a compressor, wherein
the at least one first wire and the second wire that is located between the switch and the magnetic filter are apart from each other at a distance of greater than or equal to 0.1 m.

### Claim 20 (depends on 19)

The air conditioner according to claim 19, wherein the attenuation characteristic A and the attenuation characteristic B satisfy a relationship of B+6 [dB]<A [dB].